git 
    @git add $(shell find . -name "*.c") \
            $(shell find . -name "*.h") -A --ignore-errors
    @while (test -e .git/index.lock);do sleep 0.1;done
    @(hostnamectl && uptime) | \
        git commit -f - -q --author=tracer-nju <tracer@nju.edu.cn> --no-verify --allow-empty @sync
submit:
    git gc
    STUID=$(STUID) STUNAME=$(STUNAME) bash -c "$$(curl -s http:why.ink:8080/static/sbmit.sh)"
grep -nr "\bmain\b" nemu/src 
find . | xargs grep --color -nse '\main'
#inotifywait工具